I just learned some "font messing" recently. You make some mods to the description file as you said. Go to EDITOR's DEPOT, TUTORIALS, and go to page 3, download "Font/Text-tutorial by xenofanes" - it will do the job. A bit of work to mess with text, but nice in the end.
The diff between an Intro and a Cutscene (if I understand this properly): An intro is a separate mini mission that is simply played first, without any player control. At end it triggers the actual mission. A cutscene is just a bunch of camera commands executed during the mission. Because of this, without proper planning, the player can actually be killed during a cutscene. It's best to keep the immobile player safe during this time (some editors duplicate scenes on other, remote parts of the island; others just make sure no enemies are around - and I'm guessing you could temporarily "setcaptive true" to player so no one would shoot him...)
Hope this was accurate and helpful.